Geography - note: note 1: extending 1,650 km north to south, the country is only 50 km across at its narrowest point
note 2: Son Doong in Phong Nha-Ke Bang National Park is the world's largest cave (greatest cross sectional area) and is the largest known cave passage in the world by volume; it currently measures a total of 38.5 million cu m (about 1.35 billion cu ft); it connects to Thung cave (but not yet officially); when recognized, it will add an additional 1.6 million cu m in volume; Son Doong is so massive that it contains its own jungle, underground river, and localized weather system; clouds form inside the cave and spew out from its exits and two dolines (openings (sinkhole skylights) created by collapsed ceilings that allow sunlight to stream in)
Definition: This entry includes miscellaneous geographic information of significance not included elsewhere.
Source: CIA World Factbook - This page was last updated on Saturday, September 18, 2021
